Thermostatic control



Jan. 19 1926. 1,570,446

L. MOMBARUZZO THERMOSTATIC CONTROL Filed August 4, 1924 2 Sheets-Sheet 1 INVENTOR ATTORNEY was... 19, 1926.

UNITED STATES v LUIGI momaanuzzo, or new "101m, 11. Y.

mnnnmos'ra'rrc. conrnon.

Application filed August 4-, 1924. serial m5. 729,936.

To all whom it may concern:

Bev it known that I, LUI'GI BIOMBARUZZO,

a citizen of Italy, residing at New York city, county of New York, borough of Manhattan, and State of New York, have invented new and useful Improvements in Thermostatic Control, of which the followin is a full, clear, and exact specification. I lily invention relates to thermostatic control and refers articularly to the thermostatic control of valves with special reference to gas heating devices.

My invention consists of means and devices for thermostatically controlling valves and, while they are adapted for wide application, they are particularly suitable in conjunction with gas heaters as a means for safe-guarding against the possibility of leakage or unlighted gas with the consequent danger of explosion.

Gas heating devices of the generally ado ted characters include means for automatically controlling the supply of gas to the heating units in order that a uniform temperature may be obtained.

In devices of this class, the gas supply is at times reduced to an extremely small amount, or entirely cut off. This curtailment of the gas supply frequently results in the accidental extinguishment of the flame. If the gas supply be removed, it is evident that failure of ignition will result in an accumulation of unlighted gas, which is extremely liable to explode when a light is brought into contact therewith.

To overcome this ever present danger resource is made to so-called pilot lights, that is, lights which are supplied'from an independent source of gas and which are kept continually lightedf For the sake of economy, the flames of these pilot lights are extremely small, and hence, are liable to become extinguished. If now the main heater gas supply be renewed, there is no light to ignite it and the danger of gas accumulation occurs.

It is evident, therefore, that the safet of gas heaters of this class is absolutely dependent upon the constant ignition of the pilot light gas, or of the absolute impossibility of supplying gas to the heater unit when the pilot light is extinguished.

It is evident that there can be no absolute guarantee of the constant ignition of the pilot light and that, hence, the only actual and always operative means for preventing the danger of gas accumulation is one that I will make it impossible for gas to be suplied to the heating unit during the non-' Ignition of the pilot light as.

My invention accomplis es this. desirable and valuable result inan effective automatic manner and requires no attention of the operator for its application. i

. While I have. described my inventionas' applied to gas heating devices, it is evident that it has many valuable applications;

In the accom anying draw1ngs,.illusti'ating one form 0 the device of my invention, similar parts are designated by similar numerals.

' Figure 1 is a top plan view of one form of my lnvention.

Figure 2 is aview through the line of Figure 1.

Figure 3 is a vertical cross-section of a ball valve operated thermostatically.

Figure 4 is a cross-section through 'the line 44 of Figure 3. V

Figure 5 is an end view of. two of m thermostatic leaves, the broken lines indilclating their positions under the influence of eat.

Figure 6 is a vertical cross-section of my thermostatic container and thermostatic leaves when not heated.

Figure 7 is a cross-section through the line 77 of Figure 6.

Figure 8 is a view corresponding to Figure 6 when heated.

Figure 9 is a vertical cross-section of the thermostatically controlled rod and the means for returning it to normal-position.

The particular form of thermostatic control of my invention, shown in the accompanying drawings in conjunction with my heating system, com rises a tubular member 10, one end 0 which is externally threaded to receive the internallythreaded end 11 of the container 12. A rod 13 extends through and is longitudinally movable within the tubular member 10. One end i of the rod 13 carries the conical member. 14

and the other end carries the revoluble plate 15. A spiral spring 16 within the tube 10 has its one end anchored to the flange 17, fixedly attached to the tube 10 and its other end fixedly attached to the flange 18 carried by the rod 13.. The normal tendency is to force the rod 13 into the container, or chamber, 12. The container 12 contains a plurality of thermostatic plates 19, 19, a

IOU

thermostatic plate .19 is com os ed of two plates, or layers, of metals different ooefiicients of expansion fixedly attached to each other, as shown in Figure 5. I prefer to use steel 21 and brass 22 for this purpose, although other metals may be employed. When these plates are positioned with similar faces towards each other, they will expand under the influence of heat, as shownm Figures 5 and 8.

The articular means shown in the drawings wii ment of the rod 13 may be utilized as a valve operating means comprising a ball valve 27 having the valve seat 23, the ball 24, the entrance opening 25 and the exit opening 26. Theconical member 14 of therod 13 is slidable through an opening 28 in the verticall movable member, or valve- .raising mem er 29 which is movable along the guide rods 30, 30.

The conical member 14 also rests upon the pro'ection 31.

he operation of stat is as follows When the device is at normal temperature, the several members are so positioned that the conical member 14 is withdrawn from the valve 27 so as to allow the ball 24 to be seated upon the valve seat 23 thus preventing the passage of gas therethrough. The application of heat to the casing 10 is the described thermotransmitted to the thermostatic plates 19,

19, causing them to expand, moving the rod 13 toward the valve 27 the cone 14'passing over the projection 31 while, at the same time, the cone 14 is forced through the opening 28 of the valve-raising member 29, causing the latter to rise, thus-forcing the ball 24 upwardly from its seat 23, allowing gas to pass through the valve 27. When the application of heat is removed from the container 10, the thermostatic plates 19, 19 assume their normal shape, the spring 16 forces the rod 13 into the container 12, thus drawing it outwardly from the valve 27, allowing the ball 24 to seat upon the seat 23 and closing the valve, preventing further passage of gas therethrough.

The particular arran ement of my thermostatic control in con unction with other elements to produce a safety heating system is shown in Figures 1 and 2, which are directed to a gas heating device.

A ipe 32, connected with a source of as supp dy, carries the valves 33 and 27 an is close at one end b means of the cap 34. The pipe 32 beyon the valve 27 connects with a pipe 35 carrying the valve 36. The pipe 35 eads to an ordinary gas heater urner 37. A pipe'38, connected with a source of gas supply carries the valve 39 ereby the expansion of the thermostatic plates 19, 19 and the consequent moveand the gas burner 40, which serves as a pilot light and which is directed upon the thermostatic container 12. The gas burner 40 lighted. Thc. valve 33 is then opened.

The gas can not pass through the valve 27 until the heat of the pilot light 40 causes the thermostatic elements to .openthe Valve 27. It is evident that there can be no passage of the gas into the heater 37 until the pilot light 40 is lighted, thus insuring against the escape of unlighted gas into the heater. The valve 33, 36 and 3.9. may, of course, be set to supplay the proper amount of gas for the desire conditions, and the valve 33 may be thermostatically controlled by any suitable means to regulate the amount of gasconsumed by the heater 37 and the consequent heat produced thereby.

If, for any reason, the heater flames are extinguished and the gas again caused to pass through the pipe 35, the ilot light 40 will ignite it, thus preventing t e accumulation of unlighted gas.

lf during the extinguishment of the heator gas, the ilot gas should be accidentally extinguished the thermostatic control will close the valve 27, thus preventing gas from entering the heater 37 and the thermostatically controlled gas burner 40 would close, thus rev'enting gas from entering the device t rough the pipe 38.

It will beseen from the above that the extinguishment of the pilot light will automatically cut off the gas supply to the heater, thus preventing an accumulation of unlighted gas within the heating device and acting as a warning that the system is not in safe operating condition.

My invention does not prevent, or interfere with, any desired system, or devices, for the control of the amount of gas introduced into the heater for the purpose of regulating the amount of heat generated thereby, but is an auxiliary thereto for the prevention of accidental accumulation of gas within the device due to the extinguishmefit of either the heater gas or the pilot lig t. I

I do not limit myself to the particular size, shape, number or arrangement of parts,

as shown and described, as these-are given static plates within the container so posicause the conical member to move beneath tioned that they will expand in arc formathe ball raising it from its seat, and means tion against each other when heated, a tube whereby the return of the plates to normal connecting a valve with thecontainer, a ball temperature will cause the removal of the valve, a rod longitudinally movable within conical member from beneath the ball allow- 1 the tube, means carried by the rod abuttable ing the ball to be positioned upon its seat.

upon a thermostatic plate, a' conical member Signed at New York city in the county carried by the rod and insertable beneath of New York and State of New York this a ball closure of the valve, means whereby 30th day of July, 1924.

10 the expansion of the thermostatic plates will LUIGI MOMBARUZZO. 

